thorium: fix running time regression on argonnite-1x28
thorium: fix running time regression on argonnite-1x28

It seems that a larger buffer size when running on 1 node is better.

time scripts/development/run-argonnite-1-28.sh

79c6faf spate: make sure that spate is deterministic                    22m18.141s
83a85f3 thorium: lower the ideal buffer size to 2 KiB                   21m30.391s
b26dfd8 thorium: increase the number of active messages allowed         14m25.059s
da2b2aa message_cache: improve robustness by checking the reply action  15m31.564s

Link: https://github.com/GeneAssembly/biosal/issues/780
Signed-off-by: Sébastien Boisvert <1a4d2e25eb5ba040b6ad5779a730a1a8a0ff9bc5@anl.gov>

GeneAssembly/biosal,sebhtml/biosal,GeneAssembly/biosal,sebhtml/biosal,sebhtml/biosal,GeneAssembly/biosal,GeneAssembly/biosal,sebhtml/biosal,sebhtml/biosal,sebhtml/biosal,GeneAssembly/biosal,GeneAssembly/biosal